Slide stop valve



Nov.- 20, 1928.

W. FRB

SLIDE sToP vALvn Filed oct. 11, 1926 5 Sheets-sheet 1 7///////// M H M` Hg. f7? W02 lar WMM/P934' Nov.- 20, 1928.

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SLIDE sToP VALVE Filed Oct. 1l, 1926 W////////////xl Sil 3 Sheets-Sheet 2 www Nov.l 20, 1928. 1,692,496

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SLIDE STOP VALVE Filed Oct. 11, 1926 3 Sheets-Sheet 5 4 1s m19 I L J sof-jr; /Q'-pao ,34 1 ULM I Inventar www Patented Nov. zo, 192s. 1,692,496

UNITED ism'lvrlzs PATENT orifice.

WALTHEB I RB, F EBERSWALDE, NEAR BERLRI', GERMANY, ASSIGNOR T0 THE FIRE FRANZ SEIFFERT & CO., AKTIENGESELLSCHAFT, 0F BERLIN, GEBIANY.

SLIDE strop VALVE.

Application illed October 11, 1926, Serial No. 140,952, and in Germany October 18, 1925.

In slide stop valves of the types hitherto known, which are provided with a packing on each side and in which the tightening surfaces of the slide face and of the casing are not in contact with each other during the up and down-movement, the contact is brought about and discontinued by the axial spreading of the two-part slide face when in its lower position.

The slide valve according to the present invention is distinguished from the types mentioned above by its non-spreadable slide face, while both the` tightening surfaces of the casing are axially movable. This improved slide is intended for use especially 1n connection with high-pressure steam or another iiuid under high pressure, and its chief characteristic features reside in that Ifrictional contact on both sides of the sliding member proper with the opposite tightening faces of certain tubular slidable members hereinafter fully dealt with is completely prevented, iny that two of said tubular slidable members are provided and these members can be movcd towards and pressed against, as Well as withdrawn from, the said slide proper, this latter being movable only after certain gaps have been formed between it and the said slidable tubular members, all as fully described hereinafter.

An embodiment ofh the slide stop valve according to the present invention is shown in the accompanying drawings wherein:

Figs. I-IV are vertical longitudinal sec tions, Fig. I showing the slide valve closed, Figs. II and III each showing it in one of the intermediate positions, and Fig. IV showing the valve fully opened;

Fig. V is a cross-section on line V--V of Fig. I, and

Fig. VI is a cross-section on line VI-VI of Fig. I f

In all of the figures, 1 is the valvey casing, 2 is a hollow stem whichfis movable up and down and can be rotated by means of a handwheel 4 and an intermediate bush or sleeve 3. At the top the stem 2 is provided with a collar 5 and at the bottom it has exterior screw threads of low pitch 6 and interior screw threads following the same direction but having a higher itch, in the present case four times that of t e exterior thread. In

the upper part 8 of the casing there is a fixed stop against which a-eollar 5 will abut, thereby llmiting the downward movement of the hollow stem 2. There is also a movable stop 9 in the upper part of the casing which is pushed by the cooperation of the hand-wheel 4, the bush 3, and bevel-gear 10.

11 is a nut having pins 12 (Fig. V) at diametrically opposed places which serve as bearings for a frame 13. The latter has two pairs of arms 14 which embrace guiding ribs 15 provided within the casing 1 whereby both the frame 13 and the nut 11 are prevented from rotating. The ribs 15 are situated in the same plane with the axis of the stem 2 and admit of a balancing movement of the frame about the pins 12.

At right angles to thel pins 12 two ins 16 are provided on the frame 13"on w ich two two-armed levers 17 are mounted. to the ends of which rods 18 are linked. Each of these four rods actuates one of four bellcrank levers 19 which are mounted Within the lower part of the casing 1. Each two of these bell-crank levers 19 actuate one of two tubes 20 slidably mounted in the casing. The arrangement of parts 11-17 forms a Cardan suspension for the rods 18 which are thereby enabled uniformly to actuate the bell-crank levers 19 whose driving arms are moving in grooves 21 provided in the sliding tubes 20.

The end faces 22 of the slidin tubes 2O form the tightening surfaces of t e casing. Packing rings or the like 23 serve to tighten the sliding tubes 20 and the casing 1 relatively to one another.

The sliding plate 24 is carried by a nonrotatable threaded stem 26 engaging the interior threading of the hollow stem 2. The plate 24 is provided with lateral lu s 27, by means of which it is guided on r1`s 28 in the casing 1 which are running parallel to the stem 26. The downward movement of the plate 24 is limited by a stop 29.

Two bars 30 running in guideways provided in the casing are taken along by the sliding tubes 20 by means of ins 31, the latter penetrating through axia slots 32 in that part of the casing surrounding the tubes 20. The ends 33 of the bars 30 which lare 'adjacent the sliding plate 24 project beyond the tightening surfaces 22 of the sliding tubes4 20.

The operation of the slide valve is as follows: In-closed condition the late 24 is in its lowermost position, the sli in tubes 20 being firmly pressed against it. T e bars 30 overlap the plate 24, and the hollow stem 2 is in its raised position. When the' handwheel 4 is turned in the direction of the arrow, i. e. inv a counter-clockwise direction, each rotation will cause the hollow stem 2 to screw itself down four threads, the bars 30 holding the sliding plate 24 in fixed position. The nutl 11 will rise on the stem 2 one thread per revolution, thus being actually lowered three threads. By means of the Cardan suspension 11-17 this motion is transmitted to the rods'18, whereb tbe bell-crank levers 19 arc caused to 'pus the sliding tubes 20 outwardly until the bars 30 will release the plate 24:, as clearly appears from Fig. II. i

Upon the plate 24 being released by the bars 30 the sliding tubes 20, and with them the nut 11, will be arrested; the hollow stem 2 will screw itself down into the nut one thread per revolution while the stem 26 will screw itself into the stem 2 fourl threads per revolution. The plate 24 will also rise three threads per revolution until the collar 5 abuts against the stop 7, the .movable stop 9 also having been pushed close up to the collar 5, as is shown in Fig. III. In this osition the slide valve is opened far enough or action.

On further rotation of the hand-wheel 4c the hollow stem 2 will stop. While the plate 24 will now rise four threads per revolution the nut 11 rises one thread per revolution and will, by means of the Cardan suspension 11'-17, the rods 18, and the bell-crank levers 19, draw the sliding tubes 2O together until the tightenin surfaces 22 come in contact. Simultaneous y the movable stop 9 will move forward far enough to overlap the collar 5 as shown .in Fig. IV. In this position the interior of thevalve casing is shut oil from steam or the like and protected against dirty- Itotation of the hand-wheel 4 in opposite direction, i. e. in clockwise direction, will cause the stem 26 and plate 24: to move downward. Simultaneously the nut 11 will also move downward, thereby pulling the tubes 20 apart until the movable stop 9 will release the collar 5 (see Fig. III). Now the sliding tubes 20 and the nut 11 will stop, the hollow stem 2 will rise one thread per revolution, while the plate 24 will descend three threads per revolution. As soon as the plate 24- is supported on the stop 29 (Fi II) the hollow stem 2 will screw itself up ourthreads per f revolution, carryin the nut 11 up three threads per vrevolution whereby the sliding tubes 2O will be drawn towards the plate 24, as shown in Fig. I.

What I claim as new and desire to sccire by Letters Patent is 1. yA slide,stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftable tubular member in each ot' said branches; a slide adapted to be introrbufed between, and withdrawn from, said tubular members; an operating mechanism for said slide and the tubular members and comprising means for lowering and lifting the slide, means for pressing the tightening faces of the tubular members against, and for withdrawing them from, the lowered slide, and means for pressing the tubular end members against one another when the slide is lifted.

2. A slide stop-valve, comprising in combination, a casin and two oppositely located branches extent ing thereinto; a sbiftable tubular member in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; an Aoperating mechanism lfor saidslide and the tubular members and comprising means for lowering and lifting the slide, means for pressing the tightening faces of the tubular members against, and for withdrawing them from, the lowered slide, and means for pressing the tubular end members against one another when the slide is lifted; and members coupling said several means in such a manner that the said tubular members are shiftable towards and away from the said slide when the slide is in its closing position.

8. A slide stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftable tubular member in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; an operating mechanism for said slide and the tubular members and comprising means for lowering and lifting the slide, means for pressing the tightenn faces of the tubular members against, and or withdrawing them from, the lowered slide, and means for pressing the tubular end members against one another when the slide is lifted; and members coupling said several means with each other in such a manner that the tubular members are moved towards, and pressed against, each other after the slide is lifted.

4. A slide stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftable tubular member in eachof said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; a non-rotary threaded spindle extending upwardl from said slide, a rotary hollow spindle avin an interior thread engaged by the threa of said non-rotary spindle, said hollow spindle further having an exterior thread and being axially movable, means for turning, as well as lifting and lowering, said hollow spindle, a collar upon the sameya stationary abutment member and a movable abutment member both co-operating with said collar, a nut upon the exterior thread of the hollow spindle, rods extending downwardly from said nut to the shiftable tubular members and being indirectly and movably connected with the said nut, bell-crank levers carried by the said branches of the casing and being connected at one 'able tubular arm with one of said rods and at the other arm with one of the said lshiftable tubular members, substantially as set forth.

5. A slide stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftmember in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; a non-rotary spindle having an exterior thread with a steep-pitch and extending upwardlylI from'said slide, a rotaryA hollow spindle ving an interior thread with a correspondingly steep pitch engaged by the thread of said non-rotary splndle,

said hollow spindle further having an exterior thread of normal itch and being axially movable, means or turning, as well as lifting and lowering, said hollow spindle, a collar upon the same, a stationary abutment member and a movable abutment member both co-operating with said collar, a nut upon the exterior thread of the hollow spindle, rods extendin downwardly from said nut to the shifta le tubular members and being indirectly and movably connected with the said nut, bell-crank levers carried by the said branches of the casing and being 6. A. slide stop-valve, comprising in combination, a casing and two oppositely loc'ated branches extending thereinto; a shiftable tubular member in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular tending upwardly from said slide, a rotary hollow spindle having an interior thread engaged by the thread of said non-rotary spindle, said hollow spindle further having an exterior thread and being axially movable, means for turning, as well as lifting and lowerin said hollow spindle, a collar upon the ho low spindle, a stationary abutment member and a movable abutment member both co-operating with said collar, a nut upon the exterior thread of the hollow spindle, pivots projecting from said nut on opposite sides of the same, a horizontal frame carried by said pivots, other pivots extending from said frame at right angles with respect to the first-mentioned pivots, double-armed levers carried by said other pivots, rods extending downwardly from said levers to the shiftable tubular members and being indirectly and movably connected with the said nut, bell-crank levers carried by the said branches of the casing and being connected at one arm with one of said rods andv at the other arm with one of the said shiftable tubular members, substantially as .set forth.v

In testimony whereof, I have signed my name to this specication.

WALTHER l FRB.

, members; a non-rotary threaded spindle ex- 

